/Engine/Source/Runtime/GeometryCore/Public/FrameTypes.h
Project 3D point into plane and convert to UV coordinates in that plane
2D coordinates in UV plane, relative to origin
[TVector2](API\Runtime\Core\Math\TVector2)< RealType > ToPlaneUV ( const [TVector](API\Runtime\Core\Math\TVector)< RealType > & Pos, int PlaneNormalAxis ) const